Want to add a tack to my 06 Deluxe FLSTNI. My diagram says one wire conects to Tachometer power/ingition positive lock. I have no clue what this is and hoping someone here can guide me.
Does the tach have 5 wires?
If so, it sounds like the short black wire goes to the ignition switch so when you turn the ignition on it will complete the circuit and power the backlight in the tach.